It was a basin, in whose depths the water boils and bubbles violently; and near this basin are two unsightly holes, from which columns of smoke periodically rise with a great noise.

Whilst this is going on, the basin fills itself more and more with water, but never so much as to overflow, or to force a jet of water into the air; then the steam and the noise cease in both cavities, and the water in the reservoir sinks several feet.
This strange phenomenon generally lasts about a minute, and is repeated so regularly, that a bet could almost be made, that the rising and falling of the water, and the increased and lessened noise of the steam, shall be seen and heard sixty or sixty-five times within an hour.
In communication with this basin is another, situate at a distance of about a hundred paces in a small hollow, and filled like the former with boiling water.

As the water in the upper basin gradually sinks, and ceases to seethe, it begins to rise in the lower one, and is at length forced two or three feet into the air; then it falls again, and thus the phenomenon is continually repeated in the upper and the lower basin alternately.
At the upper spring there is also a vapour-bath.

This is formed by a small chamber situate hard by the basin, built of stones and roofed with turf.

It is further provided with a small and narrow entrance, which cannot be passed in an upright position.